What is the evidence that global warming is a real process caused by human activities?

Answer 1

Global warming is certainly a real process. The year 2010 had the warmest global average temperature on record, fractionally warmer than 2005 and 1998, but as the difference is slight, the three years are regarded as the equal hottest. The past decade was the warmest since instrumental measurement began in 1850, and the ten warmest years since 1850 have now all occurred since 1998.

It is also known that the temperature rise that the world has experienced is consistent with the rise in atmospheric carbon dioxide levels, from the normal range of 260-280 parts per million (ppm) to 380 ppm. Scientists say that because carbon dioxide is a greenhouse gas, it is this increase that has caused average global temperatures to rise. So the question is whether this increase in atmospheric carbon dioxide and the resultant temperature rise are caused by human activities, and are therefore anthropogenic.

Scientists have been able to use isotope comparisons for C12, C13 and C14 ratios, to prove that the increase from 260-280 ppm to the present 380 ppm of atmospheric carbon dioxide is entirely due to human activities. This joins the dots and tells us that global warming is not only real, it is caused by human activities.

The majority of the world's climate scientists agree that the temperature of the world has been gradually rising for the past 150 years, since the time man started seriously burning coal and oil.

NASA (National Aeronautics and Space Administration) states on its website that the measurable evidence is in the following:

• Sea level rise
• Global temperature rise
• Warming oceans
• Shrinking ice sheets
• Declining Arctic sea ice
• Glaciers retreating
• Extreme Climate Events
• Oceans become more acidic

See the NASA weblink below.

Try Al Gore's Documentary: An Inconvenient Truth

Answer 2

Industry, a successful industry couldn't have been fueled by the destruction and distortion of nature and natures resources. Are we to blame entirely many do not believe so. Time, natural disasters and the way of the world play their parts, its more of an 85 to 15 percent caused by us. Evidence could be the population increase and the animal decrease or how the polar ice caps are not as cold due to sea trade and modernization. there is evidence that it is changing, are people out their working to keep it safe? Yes!

Answer 3

• We can measure that the temperature is rising.
• We know that carbon dioxide is a greenhouse gas that captures heat in the atmosphere.
• We know that burning fossil fuel releases carbon dioxide.
• We know that fossil fuel stores carbon from 300 million years ago.
• We know that we have been burning fossil fuels since the Industrial Revolution.
• We know that carbon dioxide levels are increasing in the atmosphere.
• We can test the carbon dioxide in the atmosphere and prove that it comes from the fossil fuels.

All this makes climate scientists sure that global warming is happening because of human activity.

• We can measure that the temperature is rising.
• We know that carbon dioxide is a greenhouse gas that captures heat in the atmosphere.
• We know that burning fossil fuel releases carbon dioxide.
• We know that fossil fuel stores carbon from 300 million years ago.
• We know that we have been burning fossil fuels since the Industrial Revolution.
• We know that carbon dioxide levels are increasing in the atmosphere.
• We can test the carbon dioxide in the atmosphere and prove that it comes from the fossil fuels.

All this makes climate scientists sure that global warming is happening because of human activity.

Answer 4

• We can measure that the temperature is rising.
• We know that carbon dioxide is a greenhouse gas that captures heat in the atmosphere.
• We know that burning fossil fuel releases carbon dioxide.
• We know that fossil fuel stores carbon from 300 million years ago.
• We know that we have been burning fossil fuels since the Industrial Revolution.
• We know that carbon dioxide levels are increasing in the atmosphere.
• We can test the carbon dioxide in the atmosphere and prove that it comes from the fossil fuels.

All this makes climate scientists sure that global warming is happening because of human activity.

Answer 5

• We can measure that the temperature is rising.
• We know that carbon dioxide is a greenhouse gas that captures heat in the atmosphere.
• We know that burning fossil fuel releases carbon dioxide.
• We know that fossil fuel stores carbon from 300 million years ago.
• We know that we have been burning fossil fuels since the Industrial Revolution.
• We know that carbon dioxide levels are increasing in the atmosphere.
• We can test the carbon dioxide in the atmosphere and prove that it comes from the fossil fuels.

All this makes climate scientists sure that global warming is happening because of human activity.